Παραπομπή σε μορφή APA (7η εκδ.)

International Conference on Integral Equations and Inverse Problems Varna, Bulgaria, Petkov, V., & Lazarov, R. (1991). Integral Equations and Inverse Problems. Longman.

Παραπομπή σε μορφή Chicago (17η εκδ.)

International Conference on Integral Equations and Inverse Problems Varna, Bulgaria, Veselin Petkov, και Raicho Lazarov. Integral Equations and Inverse Problems. Harlow, Essex: Longman, 1991.

Παραπομπή σε μορφή MLA (9th εκδ.)

International Conference on Integral Equations and Inverse Problems Varna, Bulgaria, et al. Integral Equations and Inverse Problems. Longman, 1991.